https://ap1.salesforce.com/services/data/v29.0/sobjects/Contact/updated/?start=2015-01-5T17%3A34%3A55.716Z&end=2015-01-15T19%3A21%3A03.904Z gives error saying
[{"message":"Error parsing the 'start' date string. This operation requires properly formatted 'start' and 'end' date/time parameters to be specified. Please consult the documentation for the format of these date/time fields.","errorCode":"INVALID_DATE_FORMAT"}] I am using php for coding.